stomach lining Parietal cells (secrete HCD (secrete pepsinogen) Stomach Gastric mucosa (secretes gastrin) Pancreas ancreatic d Exocrine cells of pancreas Zy coll ct and exopeptidase Villi of small intestine Small Vill Intestine Intestinal (absorbs aminoPepsin Chymotrypsin,trypsin, and exopeptidases Amino acids